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Finding the Fourth Proportional to 521.73, 720.11 and 300.76

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Solution

The fourth proportional to 521.73, 720.11 and 300.76 is: 415.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    521.73 : 720.11 = 300.76 : x
  2. Step 2: Convert to fraction form
    521.73/720.11 = 300.76/x
  3. Step 3: Cross multiply
    521.73x = 720.11 × 300.76
  4. Step 4: Simplify right side
    521.73x = 216,579.24
  5. Step 5: Solve for x
    x = 216,579.24/521.73
  6. Step 6: Final answer
    x = 415.12

Related Problems

Find fourth proportional to 260.87, 360.06 and 150.38
Half scale
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Double scale
Find fourth proportional to 522.73, 721.49 and 301.76
Similar ratio
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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.